Feature-gate explicit unboxed closure method calls & manual impls,

detect UFCS drop and allow UFCS methods to have explicit type parameters.

Work towards #18875.

Since code could previously call the methods & implement the traits
manually, this is a

[breaking-change]

Closes #19586. Closes #19375.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 5ad9462daf2..51bf7ba0a2a 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -59,7 +59,7 @@
 #![allow(unknown_features)]
 #![feature(globs, intrinsics, lang_items, macro_rules, phase)]
 #![feature(simd, unsafe_destructor, slicing_syntax)]
-#![feature(default_type_params)]
+#![feature(default_type_params, unboxed_closures)]
 #![deny(missing_docs)]
 
 mod macros;